21 Stormwater Mgmt Report_082025

NOAA 24-hr D 100-Year-Future Rainfall=11.52", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 32 Summary for Pond PP1: Pervious Pavement Inflow Area = 11,761 sf,100.00% Impervious, Inflow Depth = 11.28" for 100-Year-Future event Inflow = 2.60 cfs @ 12.04 hrs, Volume= 11,054 cf Outflow = 2.20 cfs @ 12.11 hrs, Volume= 10,030 cf, Atten= 15%, Lag= 4.4 min Primary = 2.20 cfs @ 12.11 hrs, Volume= 10,030 cf Routed to Link P1 : PDA 1A Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.10 hrs / 9 Peak Elev= 367.26' @ 12.11 hrs Surf.Area= 8,538 sf Storage= 2,077 cf Plug-Flow detention time= 116.8 min calculated for 10,030 cf (91% of inflow) Center-of-Mass det. time= 63.9 min ( 796.6 - 732.7 ) Volume #1 Invert 366.65' Elevation (feet) 366.65 367.65 Avail.Storage 3,415 cf Surf.Area (sq-ft) 8,538 8,538 Device #1 Routing Primary Invert 365.50' #2 Device 1 366.95' Storage Description Custom Stage Data (Prismatic)Listed below (Recalc) 8,538 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 8,538 Cum.Store (cubic-feet) 0 8,538 Outlet Devices 15.0" Round RCP_Round 15" L= 273.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 365.50' / 364.15' S= 0.0049 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=2.16 cfs @ 12.11 hrs HW=367.25' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 2.16 cfs of 5.59 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 2.16 cfs @ 1.80 fps)